RFU
Here are the schematics I made for the RFU. I actually built
mine right into the Sega Master System itself. Using this information
you can build one internally or for external use. I decided to use variable
resistors so I could adjust the speed of the rapid fire. in some games like
Rocky the rapid fire can be to fast or to slow. This way you can set it to
the optimal speed for you. The best way to test this is to use a led between
the ground and the output before hooking it up to the controller. This way
you can get a visual of how fast the button is repeating. Good Luck!
The 555 Timer is still sold at
Radioshack and the catalog number is
276-1723
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